The Constsnts documentation for oop5

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@163601 c90b9560-bf6c-de11-be94-00142212c4b1

language/oop5/constants.xml

@@ -1,11 +1,38 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.1 $ -->
+<!-- $Revision: 1.2 $ -->
  <sect1 id="language.oop5.constants">
   <title>Object Constants</title>
   <para>
-   .
+   It is possible to define constant values on a per-class basis remaining 
+   the same and unchangeable. Constant's differ from normal variables
+   in that you dont use the <varname>$</varname> symbol to declare or use 
+   them.  Like <xref linkend="language.oop5.static"/> members, constant
+   values can not be accessed with a variable that is an instance of the 
+   object.
   </para>
 
+  <example>
+   <title>Defining and using a constant</title>
+   <programlisting role="php">
+<![CDATA[
+<?php
+class MyClass {
+  const constant = 'constant value';
+
+  function showConstant() {
+    echo  self::constant . "\n";
+  }
+}
+
+echo MyClass::constant . "\n";
+
+$class = new MyClass();
+$class->showConstant();
+/* echo $class::constant;  is not allowed */
+?>
+]]>
+   </programlisting>
+  </example>
 
  </sect1>